To be honest, I felt this way alot when I babysat my DGC. I loved them to death, but week-end after week-end, I was asked to baby sit for one daughter or an other. I think I resented being taken for granded, not that I had anything else to do. I was a widow. I finally learned to say no without guilt. Then when I did babysit, I was happy to do it. If the "blues" last too long, make sure you check in with your DR.